CONTENTS. JX 



Cenc e.Calendar of Flora. Period of Flowering. Mode of advanc- 

 ing or retarding it. Annular Section. Fructification of the Seed 

 prevented by Rain. ... 205 



CONVERSATION XVIII. 



ON COMPOUND FLOWERS. 



A Head, or Capitate. Receptacle. In volucrum. Compound Flowers. 

 Calyx. Elongation of Tuft or Pappus. Coma. Akene. De- 

 scription of the Florets of a Compound Flower. - - 216 



CONVERSATION XIX. 



ON FRUIT. 



Conversion of the Flower into Fruit. Pericarp. Pea Pod. Legumen. 

 Epicarp. Mesocarp. Endocarp. Fruits composed of one Carpel. 

 Drupa, or Stone Fruits. Fruits composed of several Carpels resulting 

 from a single Flower. Poeony. Raspberry. Fruits formed of sev- 

 eral Carpels, with the Calyx adhering. Pome: Apple, Pear, Quince, 

 Medlar. Bacca or Berry: Gooseberry, Grape, Currant, Strawberry, 

 Mulberry. Fir Cone. Akene. Magnolia Cone. Spanish Ches- 

 nut. Horse-Chesnut. ..... 223 



CONVERSATION XX. 



ON THE SEED. 



Structure of the Seed. Spermoderm. Testa. Mesosperm. Endop- 

 leura. Amnios. Embryo Plant. Cotyledons. Eye, or Hilum. 

 Cicatrix. Albumen. Nucleus, or Kernel. Germination. Embryo, 

 consisting of the Radicle, Plumula, and Cotyledons. Seeds in ger- 

 minating require Moisture and Substraction of Carbon. Oxygen re- 

 quired for that Purpose. Light injurious to Germination. Tempe- 

 rature requisite. Of Sowing Seed. Knight's Experiment on the 

 Direction of the Roots and Stems. Modes of Sowing. Advantage 

 of sowing thin. Sowing in Gardens. Hot-beds, Garden-pots, &c. 

 Transplantation. ..... 236 



CONVERSATION XXL 



ON THE CLASSIFICATION OF PLANTS. 



Necessity of some Mode of Classification. Species. Genera. Nomen- 

 clature. Character of Genera. ... 250 



